I had a former friend who I already suspected of being very narcisstic.
She absolutely insisted on coming to my chemotherapy session and I was already quite upset due to the fact that I was, you know, a stage four cancer patient with two young kids.
She then proceeded to tell me that she couldn't deal with my negavity; it was affecting her health because she was an "empath" and she absorbed too many of my negative feelings.
She then said that she believed hugely in karma. She said that karma was the reason she believed she'd just won a shed load of money (over £100k). She then continued to say that she believed that bad things like illnesses happened to people because of the same karma.....
And she let her sentence tail off meaningfully. 
It was not the only massively bitchy thing she said and did that day.
When she left the nurse who had heard the whole thing told me in no uncertain terms that this friend was actually no friend at all.
The friend then refused to speak to me for the next six weeks; blanked me, shut the door in my face etc.
Then came crawling back wanting my friendship (because her attempts to befriend and love bomb another prospective friend apparently didn't work out).
She then apparently got very upset why I didn't want to talk to her anymore.
She still tells people she "did everything" for me as a cancer patient and that she has no idea why I stopped speaking to her.
It was for a myriad of narcissistic tendencies she displayed but the karma thing sticks in my head.
As a result I hate it when people say they believe in karma because what they're actually saying therefore is that I deserved to get stage four cancer at the age of 39.